Exhaust-muffler.



W. J. GRIFFITH.

EXHAUST MUFFLER.

APPLICATION FILED MAY 11,1912.

1,055,270.. K Patented m1111913.

/ .Z ZZ 5' v Il accomplished and the various novel features WILLIAM J. emrrrrngpr' rnrmourn, MICHIGAN;

EXHAUST-Murana.

'Specloation of Letters Patent. Application illed May 11, 1912.. Serial No. 696,713.

Patenten/rar. a, iai e.

To all whom, #may concern.' Be it lknown that I, WILLIAM` J. GRIFFITH, v'a citizen of the United States, residing at Plymouth, county' of Wayne, State of Michi- 5 gan, have ,invented a certain new and useful Improvement in Exhaust-Mufflers, and de-V clare the following-to be a full, clear, and exact description of the same, such as will enable-others skilled in the art to which it pertains to make land use the same, reference being had `to the accompanying drawings, which form a part of this specification.

This invention relates to exhaust mutilers and lan' object thereof is a muliler that is simple and durable, in construction, inexpensivetomanufacture vand eicient inoperation. l

A further object is a device of the char.'- acter stated in whichvlittle or no back pressure is developed in operation.

.A further object is an exhaust muier whose capacity automatically alters in accordance with the'needsof the-engine to which it may beattached. 1

' The means by which these objects may be of construction are hereinafter morefully described and claimed and shown in the accompanying-,drawings in which-fv Figure 1 is a vertical longitudinal section of a muliier embodying my invention. Fig. 2` is a section on line. y-g/ of Fig. 1. Fig. 3 is asection on line lm-aa of Fig. 1. l

Similar characters refer to similar parts throughout the drawings and specification. The device is preferably formed of 4a cylindrical shell 1 in opposite ends of which` Aare heads 2, 3. The shell is preferably formed of sheet metal and the heads are preferably of cast-metal and provided with 'an annular seat 4 for the ends of the shell 1. The three parts are fastened in their proper relation by the rods 5, v5, 5 passing longitudinally through the shell andprovided with nuts upon each end thereof engaging the, heads. Mounted upon the rods and in substantially equidistant relationare a series of baliie plates 6, 6, 6, ctc.,providedI with apertures through which the rods pass and also having a series of apertures 7 forming passageways for exhaust gas and, as also may be seen in the drawings, the diameter of the plates is less than the general diameter ofthe shell providing a passageway 8 be-k 55 tween the edge of each plate and the shell.

The plates are held 'in their proper relathe exhaust tubing of the engine.

tion on the rods 5 by means of short pieces of tubing 9, 9, etc., slidable on the rods and there is a spacing tubebetween each of the plates and between the first of the series of plates and one of .the heads, butn'o spacer is provided between the last of the series of plates and the head contiguous thereto, andf between` said last mentioned plate and the contiguous head is placed a coil-spring 10 normally forcing the plates toward the intake end 11 of the mutiier, which is apertured' in the ordinary manner. for4 the reception of ,1

If the engine be running under 'a load and` at slow speed the ,plates` will usually remain in their normal position under the action of the spring, and' .if the light i engine speed be increased, whe'reby the quan s tity of gas discharged is greatly increased, the pressure developed forces theentire series of plates toward the exhaust end 3 of the muiiier and ini/so doing the plates 6 approach and may eventually come into alinement with the annular groove 12 formed in the shell, at which point the shell'.` is greater in diameter and whereby greater space is provided between the edge oeach plate and .the shell which increases the size of the passageway for the exhaust as as may be demanded by the engine.

creases, the plates again assume their nor-l mal posit-ion under the action of the s ring'.

s the engine -speed decreases and the amount of gas delivered to the muier correspondingly de- The head at the exhaust end of. a mu er is" apertured at 15 and preferably threaded for the reception offthe vshort piece'of tubing usually-used therewith.

While I- have shown a single spring 1() by means of which the plates are held in their normal position, it is to be'understood that a spring maybe placedfon each of the rods shown to perform the same function and that various other lalterations in the 'general construction of the device may be'. made Without departing from the spirit' of this the shell irtheir relative position, baffle plates ete.:` t ian the shel slidable on the rods, said plates being lessA drical shell, apertured heads therefor having an annular seat for the shell, rods passing longitudinally through the shell for holding the sheli and headsin their proper relation, baille plates on the rods, spacers on the rods for holdin `the platesl in equidistant relation, the p ates being less in diameter than the shell and said shell having an annular portion `contiguous to each plate'greater in ldiameter than the general diameter ot the shell, and means for yieldingly holding the plates in their normal position.

3. An exhaust muiiier comprising a cylindri'eal shell provided with circumferential grooves, apertnred heads for the shell, rods passing longitudinally through the shell for Imaintainin the heads and the shell in iixed relation, a aflle plate slidably mounted on the rods normally positioned to one side of each oove, said lates being less in diamlland yieldable means for holding the plates in their normal position.

fl. An exhaust muier comprising a cylinvirion! shell an apertured head in each end 'f the Shel provided with an annular seat therefor, rods passing longitudinally through the shell for binding the heads and the shell together, apert-ured plates slidable on the rods, said plates being less in diameter than the shell, yieldable means for holding the plates in their normal position, the arrangement of parts being such that movementy of the plates from their normal position inereases the unrestricted area within the shell.

5. An exhaust mutller comprising a cylindrical shell having circumferential grooves, an apertured head at each end of the shell having an annular seat. therefor, rods passing longitudinally through the shell for binding the shell and the heads together, apertured battle plates slidably mounted on the rods normally positioned to one side ot the plane of the grooves, spacers on the rods for holding the plates in their relative position, the diameter of the plates being less than the diameter o'l" the shell, and a spring tor holding the plates in their normal position.

In testimony whereof, I sign this specification in the presente ot two witnesses.

WILLIAM J. GRIFFITH.

`Witnesses z Cuantas E. lvisNnn, SnLeNn MCDONALD. 

